<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script src="js/jquery-3.5.1.min.js"></script>
    <script src="js/number_count.js"></script>
    <script src="js/number_change.js"></script>
    <script src="js/index.js"></script>
</head>
<body>
<span id="demo"></span>
</body>
</html>